9.8 UL C/I calculation

The C/I calculation in UL is calculated so that C(j,k) is the received power from the UE_j,k at the j-th BS.

                                   (Eq. 54)

where P_t is the transmit power of the UE in dBm (see UL Power control below) and effective_pathloss is defined as in Section ‎7.6.1..

The total interference to a UL cellular system is derived from

                                                  (Eq. 55)

where

• I_inter is the interference coming from UEs of the same system but from adjacent cells, i.e. the inter-system interference from other cells. Since a fully orthogonal system is assumed, only UEs  which transmit in the same frequency subcarriers will introduce interference to each other, hence only UEs in other cells with the same k index are considered;
• I_ext(j,k) is the interference from external interfering system(s) in adjacent channel;
• N is the noise floor.

                                          (Eq. 56)

                (Eq. 57)

I_ext(j,k) is the interference to the the victim BS_j from N interfering link transmitters (ILT), where

 (Eq. 58)

for each of the victim BS_j’s frequency where the UL information is received. The ILT can be any generic systems or a BS/UEs of a cellular system.

           (Eq. 59)

at the victim system frequency. Where N_RB is the number of RBs (i.e. subcarriers) requested per UE, and M is the maximum number of RBs per BS.

                                             (Eq. 60)

where NoiseFigure_BS is the noise figure of a BS.